INT 21 - DOS 1+ - DIRECT CONSOLE OUTPUT                                         
	AH = 06h
	DL = character (except FFh)
Return: AL = character output (despite official docs which state nothing is
		returned) (at least DOS 2.1-7.0)
Notes:	does not check ^C/^Break
	writes to standard output, which is always the screen under DOS 1.x,
	  but may be redirected under DOS 2+
SeeAlso: AH=02h,AH=09h